Gear shaft pump assembly



March 12 1940- J. DECKERT. JR 2,193,394

GEAR SHAFT PUMP ASSEMBLY Filed March 22, 1939 2 Sheets-Sheet 1 Emmi J.DEcKERT. JR 2,193,394

GEAR SHAFT RUM? ASSEMBLY Filed urch 22, 1959 2 sheets-sheet 2 QN a,

(heal: Jecfz in 4 INVENTOR.

ATTRNEYS March 12, 1940.

Patented Mar. 12, 1940 UNITED s'rATEs oFricE 3 Claims.

This invention aims to provide novel means whereby rotary movement in ashaft may be transformed into straight line reciprocation, the structurebeing of useas a means for operating a pump, and for many otherpurposes.

It is within the province of the disclosure to improve generally andto'enhance the utility of devices of that type to which the presentinvention appertains With the above and other objects in View, whichwill appear as the description proceeds, the invention resides in thecombination and arrangement of parts andin the details of constructionhereinafter described and claimed, it :being understood that changes inthe precise embodiment of the invention herein disclosed, may be madewithin the scope of what is claimed, without departing from the spiritof the in- Vention.

Inthe drawings:

Fig. 1 shows in side elevation, a device constructed in accordance withthe invention, parts being in section;

Fig. 2 is a longitudinal section, parts being broken away, and partsremaining in elevation;

Fig. 3 is a longitudinal section of the portion of the device delineatedin Fig. 2;

Fig. 4 is a cross section on the'line 4-4 of Fig. 3;

Fig. 5 is a cross section on the line 5-5 of Fig. 3.

The device forming the subject matter of this application alfords ameans whereby, when rotation is imparted continuously in one direction,to a shaft having oppositely-spirally threads, right-line reciprocationwill be imparted to a driven member. Since the deviceI is capable ofmany uses, and since it is desired that it shall not be confined to anyparticular use, an illustrative utility will be set forth at this place,and then dismissed from further consideration.

A tubular support S is held by a clamp bracket 2 on the bumper 3 of amotor car. In one end of the support S there is a cylinder 4I, in whicha piston 5 is slidable', the piston being secured to a reciprocatory,tubular, driven member 5. A shaft I is mounted for rotation in one headof the support S, but is held against longitudinal movement, through theinstrumentality ofan external set collar 8 and an internal thrustbearing 9 ofV the ball type, mounted on the shaft, the aforesaid head ofthe support being interposed between the collar and the bearing, and theshaft having a retaining shoulder Ill for the bearing. Oneway rotationinay be imparted to the shaft l,

from the shaft of the engine of a motor vehicle, by way of a clutch II.

The device forming the subject matter of this application transforms theone-way rotation of the shaft 'I into right-line reciprocation of thedriven member E and the piston 5, air is drawn intoA the cylinder 4through an inlet I2, and is expelled through an outlet I4, and thus apoweroperated tire pump is aiorded. The user is left freeI to rotate theshaft 'I by any appropriate means; to take power oir the reciprocatorymember 6 for any purpose that the work in hand may dictate; and to mountthe support S on something other than a motor car.

A composite carriage C is mounted for rightline reciprocatoin in thesupport S, and embodies rings I5 and I 6, the driven member 6 beingsecuredto the ring I5. The rings I5 and I6 are fastened to connectingpieces I1, curved transversely to t slidably in the support S, theconnecting pieces having ribs I8, which are relceived` slidably inlongitudinal, internal, tracklof-f1 wir grooves I9 formed in the supportS, the carriage I C thus being constrained to straight-line recip-`rocation. A transverse partition is located within the carriage C and issecured to the connecting pieces I1.

The shaft 'thas oppositely-spiralled thread grooves 2| and- 5I. Tubularnuts 22 receive the shaft I and have inwardly-extended spiral lugs 23for cooperation, respectively, with the thread grooves 2I and 5I.'I'hrust bearings 24, of the ball type, are carried by the partition 2Uand are interposed between the inner ends of the nuts 22 and thepartition. Tubular slides 25 receive the nuts 22, and are coupledthereto by cooperating, longitudinal. spline elements 26. 'I'he slides25 are adapted to be coupled to the partition 20 of the carriage C bycooperating, longitudinal clutch elements 21. Shift pins 28 or plungersextend between the' slides 25 and are mounted for reciprocation in thepartition 20.

Yieldably-rnounted abutment rings 29 are supported slidably on the shaft'I and are located on opposite sides of the carriage C'. The rings 28are held against shoulders at the ends of the threaded part of the shaftl, by compression springs 3i), one spring engaging the thrust ballbearing 9, and the other spring engaging a stop 3|, secured to the endof the shaft 1. The stop 3I, the adjacent spring 30, and thecorrespond-ing abutment 29, are disposed within the tubular drivenmember 6. f

Referring to Fig. 3, it is desirable to make a distinction, inexplaining the operation, between parts to the right of thecarriage-partition 20 and parts to the left of it, but there seems to beno good reason for encumbering the drawings with more numerals than havebeen used, or with a complicated system of designating characters. It isbelieved that no confusion will result if, for example, reference ismade to R nut 22, instead of using repeatedly, the more cumbersomephrase: the nut 22 which is located to the right of the partition of thecarriage C.

In Fig. 3, R nut 22 must be held against rotation with respect to thecarriage C, so that when the shaft 1 is rotated clockwise, the lug 23 ofR nut 22 will follow the groove 2l, R nut 22 cooperating with R ballbearing 24, to move the carriage C to the left. R nut 22 is coupled to Rslide 25 `by R spline elements 26, and R slide 25 is coupled to thecarriage partition 2li by R clutch elements 21. L nut 2?. must be freeto turn, along with L slide `25, so that the lug 23 of L nut 22 canfollow the relatively to the carriage partition 20, and the shift pins28 are slid to the right, moving the R slide 25 to the right, the Rclutch elements 21 being disengaged, and the R slide 25 and the R nut 22being set free for rotation. By this time,

' the right end of the L slide 2| vhas been moved up to the left side ofthe carriage partition 20. The L spring 30 now reacts and moves the Lslide to the right,` bringing the L clutch elements 21 into engagement.The L slide 25 and the L nut 22 now are coupled to the carriagepartition 20, and function as -hereinbefore set forth respecting theRslide 25 and the R nut 22, the carriage C being moved to the right bythe cooperation between the lug 23 of the L nut 22. The R abutment 28 intime restores the R slide 25 to the position shown in Fig. 3, thatoperation being the same as that hereinbefore set forth in connectionwith the L abutment 2S and parts Wherewith it coacts.

What is claimed is:

1. In a machine for transforming rotary motion into right-linereciprocation, a support, a shaft mounted to rotate in the support andhaving oppositely-spiralled threads, a carriage mounted for right-linereciprocation in the support, means for taking power from the carriage,nuts cooperating with the threads of the shaft, slides held on the nutsfor right-line reciprocation, the slides and the carriage having clutchparts which couple the slides one at a time to the carriage, as eachslide moves inwardly, shift means operated by either slide, when eitherslide moves inwardly, to move the other slide outwardly and break theclutch engagement between said other slide and the carriage, andabutments supported in the path of the slides, and engaging the slides,one at a time, as the carriage reciprocates, therebyto clutch-couple theslides, one at a time, to the carriage.

2. A machine for transforming rotary motion into rightlinereciprocation, constructed as set forth claim l, and wherein the shiftmeans is a plunger, mounted to reciprocate in the car- JACOB DECKERT, JR.

